You can separate sand into many different substances by pouring it through a filter. What is sand?

Does red light or blue light have a longer wavelength? how do you know?

A runner has an initial velocity of 4 meters per second. After 20 seconds, the runner's velocity is 6 meters per second. Which is the runner's acceleration?

What is the electrical charge of an electron?

One way that a magnet's domain could become unaligned is which of the following? A. by using it too much B. by heating it C. by breaking it D. by putting it near a magnet that repels it

If you move two objects father Paul how does the force of gravity between the two objects change

Sound travels 2146 m through a material in 1.4 seconds. What is the material?

What two pieces of data indicates that uranus resides in the outer layer of the solar system.

What is acceleration? a. change in velocity/change in time b. change in distance/change in time c. change in mass/change in volume d. change in pressure/change in time

Brittany stands at rest on a skateboard. the combined mass of brittany and the skateboard is 62 kg. dave tosses a 3.7-kg pumpkin to brittany, and when she catches it, she and the skateboard begin to roll backward with a speed of 0.16 m/s.

The maximum restoring force that can be applied to the disk without breaking it is 40000 n. what is the maximum oscillation amplitude that won't rupture the disk